Debian dla-4267 : gnutls-bin - security update

#%NASL_MIN_LEVEL 80900
#
# (C) Tenable, Inc.
#
# The descriptive text and package checks in this plugin were
# extracted from Debian Security Advisory dla-4267. The text
# itself is copyright (C) Software in the Public Interest, Inc.
#

include('compat.inc');

if (description)
{
  script_id(247128);
  script_version("1.1");
  script_set_attribute(attribute:"plugin_modification_date", value:"2025/08/09");

  script_cve_id("CVE-2025-6395", "CVE-2025-32988", "CVE-2025-32990");

  script_name(english:"Debian dla-4267 : gnutls-bin - security update");

  script_set_attribute(attribute:"synopsis", value:
"The remote Debian host is missing one or more security-related updates.");
  script_set_attribute(attribute:"description", value:
"The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the
dla-4267 advisory.

    - -------------------------------------------------------------------------
    Debian LTS Advisory DLA-4267-1                [email protected]
    https://www.debian.org/lts/security/                          Adrian Bunk
    August 09, 2025                               https://wiki.debian.org/LTS
    - -------------------------------------------------------------------------

    Package        : gnutls28
    Version        : 3.7.1-5+deb11u8
    CVE ID         : CVE-2025-6395 CVE-2025-32988 CVE-2025-32990

    Multiple vulnerabilities have been fixed in GnuTLS, a library
    implementing the SSL, TLS and DTLS protocols.

    CVE-2025-6395

        NULL dereference when 2nd Client Hello omits PSK

    CVE-2025-32988

        Double-free upon error when exporting otherName in SAN

    CVE-2025-32990

        1-byte write buffer overrun in certtool

    For Debian 11 bullseye, these problems have been fixed in version
    3.7.1-5+deb11u8.

    We recommend that you upgrade your gnutls28 packages.

    For the detailed security status of gnutls28 please refer to
    its security tracker page at:
    https://security-tracker.debian.org/tracker/gnutls28

    Further information about Debian LTS security advisories, how to apply
    these updates to your system and frequently asked questions can be
    found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version
number.");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/source-package/gnutls28");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-32988");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-32990");
  script_set_attribute(attribute:"see_also", value:"https://security-tracker.debian.org/tracker/CVE-2025-6395");
  script_set_attribute(attribute:"see_also", value:"https://packages.debian.org/source/bullseye/gnutls28");
  script_set_attribute(attribute:"solution", value:
"Upgrade the gnutls-bin packages.");
  script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:N/I:P/A:P");
  script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
  script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L");
  script_set_cvss3_temporal_vector("CVSS:3.0/E:U/RL:O/RC:C");
  script_set_attribute(attribute:"cvss_score_source", value:"CVE-2025-32990");

  script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
  script_set_attribute(attribute:"exploit_available", value:"false");

  script_set_attribute(attribute:"vuln_publication_date", value:"2025/07/08");
  script_set_attribute(attribute:"patch_publication_date", value:"2025/08/09");
  script_set_attribute(attribute:"plugin_publication_date", value:"2025/08/09");

  script_set_attribute(attribute:"plugin_type", value:"local");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gnutls-bin");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:gnutls-doc");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:guile-gnutls");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls-dane0");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls-openssl27");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls28-dev");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutls30");
  script_set_attribute(attribute:"cpe", value:"p-cpe:/a:debian:debian_linux:libgnutlsxx28");
  script_set_attribute(attribute:"cpe", value:"cpe:/o:debian:debian_linux:11.0");
  script_set_attribute(attribute:"generated_plugin", value:"current");
  script_end_attributes();

  script_category(ACT_GATHER_INFO);
  script_family(english:"Debian Local Security Checks");

  script_copyright(english:"This script is Copyright (C) 2025 and is owned by Tenable, Inc. or an Affiliate thereof.");

  script_dependencies("ssh_get_info.nasl");
  script_require_keys("Host/local_checks_enabled", "Host/Debian/release", "Host/Debian/dpkg-l");

  exit(0);
}

include('debian_package.inc');

if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
if (!get_kb_item("Host/Debian/dpkg-l")) audit(AUDIT_PACKAGE_LIST_MISSING);

var debian_release = get_kb_item('Host/Debian/release');
if ( isnull(debian_release) ) audit(AUDIT_OS_NOT, 'Debian');
debian_release = chomp(debian_release);
if (! preg(pattern:"^(11)\.[0-9]+", string:debian_release)) audit(AUDIT_OS_NOT, 'Debian 11.0', 'Debian ' + debian_release);
var cpu = get_kb_item('Host/cpu');
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ('x86_64' >!< cpu && cpu !~ "^i[3-6]86$" && 'aarch64' >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, 'Debian', cpu);

var pkgs = [
    {'release': '11.0', 'prefix': 'gnutls-bin', 'reference': '3.7.1-5+deb11u8'},
    {'release': '11.0', 'prefix': 'gnutls-doc', 'reference': '3.7.1-5+deb11u8'},
    {'release': '11.0', 'prefix': 'guile-gnutls', 'reference': '3.7.1-5+deb11u8'},
    {'release': '11.0', 'prefix': 'libgnutls-dane0', 'reference': '3.7.1-5+deb11u8'},
    {'release': '11.0', 'prefix': 'libgnutls-openssl27', 'reference': '3.7.1-5+deb11u8'},
    {'release': '11.0', 'prefix': 'libgnutls28-dev', 'reference': '3.7.1-5+deb11u8'},
    {'release': '11.0', 'prefix': 'libgnutls30', 'reference': '3.7.1-5+deb11u8'},
    {'release': '11.0', 'prefix': 'libgnutlsxx28', 'reference': '3.7.1-5+deb11u8'}
];

var flag = 0;
foreach package_array ( pkgs ) {
  var _release = NULL;
  var prefix = NULL;
  var reference = NULL;
  if (!empty_or_null(package_array['release'])) _release = package_array['release'];
  if (!empty_or_null(package_array['prefix'])) prefix = package_array['prefix'];
  if (!empty_or_null(package_array['reference'])) reference = package_array['reference'];
  if (_release && prefix && reference) {
    if (deb_check(release:_release, prefix:prefix, reference:reference)) flag++;
  }
}

if (flag)
{
  security_report_v4(
    port       : 0,
    severity   : SECURITY_WARNING,
    extra      : deb_report_get()
  );
  exit(0);
}
else
{
  var tested = deb_pkg_tests_get();
  if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
  else audit(AUDIT_PACKAGE_NOT_INSTALLED, 'gnutls-bin / gnutls-doc / guile-gnutls / libgnutls-dane0 / etc');
}